[calgoo]

Sure but i hide a lot more from the intense sun in spain then i do for the softer sun in sweden. In general i think it balances out quite well.

[fluoridation]

Does vitamin D synthesis require direct sunlight, or does it work with scattered light as well?

[lukan]

Not really, it requires direct sunlight above 45 degree, so northern sweden for example gets plenty of sun in summer, but only for a very short time intense enough sun.